Refrigeration – Automatic control – Preventing – removing or handling atmospheric condensate
Patent
1984-06-21
1985-07-16
Tanner, Harry
Refrigeration
Automatic control
Preventing, removing or handling atmospheric condensate
62155, 62156, F25D 2106
Patent
active
045288216
ABSTRACT:
An adaptive demand defrost control system controls the length of an interval between defrost operations in accordance with the number and duration of compartment door-openings, the duration of a previous defrost operation as corrected by the temperature of the evaporator prior to defrost, and the length of time the compressor has been energized. A count is stored which is varied according to a decrementing schedule, with the decrementing schedule in turn being based upon a comparison of the corrected defrost duration with either a desired defrost duration or a range of desired defrost durations. A defrost operation is initiated when the count reaches a predetermined value. An alternative embodiment of the invention develops an indication of the ambient humidity and controls humidity-dependent apparatus in accordance with the indication.
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Tershak Andrew T.
Thieneman Michael D.
Tanner Harry
Whirlpool Corporation
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